1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.cellbroadcastreceiver;
18
19import android.content.Context;
20import android.os.PowerManager;
21import android.util.Log;
22
23/**
24 * Hold a wakelock that can be acquired in the CellBroadcastAlertService and
25 * released in the CellBroadcastAlertFullScreen Activity.
26 */
27class CellBroadcastAlertWakeLock {
28    private static final String TAG = "CellBroadcastAlertWakeLock";
29
30    private static PowerManager.WakeLock sCpuWakeLock;
31
32    private CellBroadcastAlertWakeLock() {}
33
34    static void acquireScreenCpuWakeLock(Context context) {
35        if (sCpuWakeLock != null) {
36            return;
37        }
38        PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
39        sCpuWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK
40                | PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE, TAG);
41        sCpuWakeLock.acquire();
42        Log.d(TAG, "acquired screen + CPU wake lock");
43    }
44
45    static void releaseCpuLock() {
46        if (sCpuWakeLock != null) {
47            sCpuWakeLock.release();
48            sCpuWakeLock = null;
49            Log.d(TAG, "released screen + CPU wake lock");
50        }
51    }
52}
53